okay I have a single in single out 40 series flowmaster, airaid intake, tb spacer, and soon to come headers and a programmer. My question is this has anyone done the same upgrades? And if you have what have you noticed that is diff about your truck, as in better performance, better gas economy, and such. Also has anyone done these mods and put thier truck on the 1/4 track and or dyno? Btw I have the 3.9V6 ext cab.
thanks